<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1130-1473</journal-id>
<journal-title><![CDATA[Neurocirugía]]></journal-title>
<abbrev-journal-title><![CDATA[Neurocirugía]]></abbrev-journal-title>
<issn>1130-1473</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Española de Neurocirugía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1130-14732006000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Meningioangiomatosis: Descripción de dos casos y revisión de la literatura]]></article-title>
<article-title xml:lang="en"><![CDATA[Meningioangiomatosis: report of two cases and literature review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Gauthier]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez de la Bárcena]]></surname>
<given-names><![CDATA[M.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-García]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hinojosa]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ricoy]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario 12 de octubre Departamento de Anatomía Patológica/Neuropatología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario 12 de octubre Departamento de Neurocirugía infantil ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>17</volume>
<numero>3</numero>
<fpage>250</fpage>
<lpage>254</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1130-14732006000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1130-14732006000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1130-14732006000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Meningioangiomatosis (MA) es una lesión benigna intracraneal poco frecuente. La mayoría de los casos son aislados, pero también se han descrito casos asociados a Neurofibromatosis (NF) tipo 2. Los casos asociados a NF suelen ser asintomáticos. Los casos no asociados a NF son sintomáticos, se presentan en niños y adultos jóvenes, y en general afectan a leptomeninge y a corteza cerebral subyacente. En este trabajo se describen 2 casos no asociados a NF en niños de 1 y 7 años de edad, que se manifestaron por crisis, las cuales desaparecieron tras la extirpación de la lesión. Histológicamente las lesiones eran de predominio celular en un caso y de predominio fibro-hialino en el otro. De la revisión de la literatura se concluye que las meningioangiomatosis no asociadas a NF suelen ser lesiones únicas, clínicamente suelen presentarse con crisis convulsivas, y pueden verse asociadas a otras patologías, fundamentalmente a meningiomas. Histológicamente las lesiones corresponden a una proliferación celular de hábito meningotelial que se dispone alrededor de los vasos corticales. A pesar de que todos los casos tienen características comunes, existe un amplio espectro de formas histológicas, que abarca desde casos más celulares hasta casos más fibrosos con calcificaciones. Estas diferencias podrían corresponder a diferentes estadios evolutivos de la lesión. La extirpación de la lesión conlleva la desaparición de los síntomas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Meningioangiomatosis (MA) is a rare benign intracraneal lesion. The majority of cases are sporadic although the association of this lesion with familial neurofibromatosis (NF) type 2 is well known. NF-associated MA may be multifocal and is often asymptomatic and diagnosed at autopsy. Non-associated cases are usually symptomatic, occurs in children and young adults and frequently arise in leptomeninges and underlying cerebral cortex. In the present work, we describe two new non-associated cases of MA in two boys, seven and one year old with seizures that disappeared after surgical excision. Histopathologically, the lesion was predominantly cellular in one case and more fibrous in the other. From the literature review we concluded that sporadic cases present as single lesions which manifest by seizures or persistent headaches. Rarely MA has been described to coexist with meningiomas. Histopathologically, MA is characterized by a plaque-like proliferation of meningothelial and fibroblast-like cells surrounding small vessels and trapping islands of gliotic cortical tissue. The lesion does not show significant atypia, mitosis or necrosis. Although all cases of MA share unifying features, there are different degrees of histological presentation with cases predominantly cellular and others more fibrous and calcified. This could correspond to different stages in the evolution of the MA. Symptoms disappear with the complete excision of the lesion.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Corteza cerebral]]></kwd>
<kwd lng="es"><![CDATA[Hamartoma]]></kwd>
<kwd lng="es"><![CDATA[Leptomeninge]]></kwd>
<kwd lng="es"><![CDATA[Meningioangiomatosis]]></kwd>
<kwd lng="es"><![CDATA[Meningioma]]></kwd>
<kwd lng="es"><![CDATA[Tumor]]></kwd>
<kwd lng="en"><![CDATA[Cerebral cortex]]></kwd>
<kwd lng="en"><![CDATA[Hamartoma]]></kwd>
<kwd lng="en"><![CDATA[Leptomeninge]]></kwd>
<kwd lng="en"><![CDATA[Meningioangiomatosis]]></kwd>
<kwd lng="en"><![CDATA[Meningioma]]></kwd>
<kwd lng="en"><![CDATA[Tumour]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><B><font face="Verdana" size="4"><a name="top10"></a>Meningioangiomatosis. Descripci&oacute;n    de dos casos y revisi&oacute;n de la literatura</font> </b></p>     <p><B><font face="Verdana" size="4">Meningioangiomatosis: report of two cases and    literature review</font> </b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>A. Su&aacute;rez-Gauthier; M.R. G&oacute;mez de    la B&aacute;rcena; E. Garc&iacute;a-Garc&iacute;a; J. Hinojosa* y J.R. Ricoy</b></font></P >     <P   ><font face="Verdana" size="2">Departamentos de Anatom&iacute;a Patol&oacute;gica    / Neuropatolog&iacute;a y *Neurocirug&iacute;a infantil. Hospital Universitario    12 de Octubre. Madrid.</font></P >     <P   ><font face="Verdana" size="2"><a href="#Dirección">Dirección para correspondencia</a></font></P >     <P   >&nbsp;</P >     <P   >&nbsp;</P > <hr size="1">     <P ><b><font face="Verdana" size="2">RESUMEN</font></b></P >     ]]></body>
<body><![CDATA[<P ><font face="Verdana" size="2">La Meningioangiomatosis (MA) es una lesi&oacute;n    benigna intracraneal poco frecuente. La mayor&iacute;a de los casos son aislados,    pero tambi&eacute;n se han descrito casos asociados a Neurofibromatosis (NF)    tipo 2. Los casos asociados a NF suelen ser asintom&aacute;ticos. Los casos    no asociados a NF son sintom&aacute;ticos, se presentan en ni&ntilde;os y adultos    j&oacute;venes, y en general afectan a leptomeninge y a corteza cerebral subyacente.    <br> En este trabajo se describen 2 casos no asociados    a NF en ni&ntilde;os de 1 y 7 a&ntilde;os de edad, que se manifestaron por crisis,    las cuales desaparecieron tras la extirpaci&oacute;n de la lesi&oacute;n. Histol&oacute;gicamente    las lesiones eran de predominio celular en un caso y de predominio fibro-hialino    en el otro.    <br> De la revisi&oacute;n de la literatura se concluye    que las meningioangiomatosis no asociadas a NF suelen ser lesiones &uacute;nicas,    cl&iacute;nicamente suelen presentarse con crisis convulsivas, y pueden verse    asociadas a otras patolog&iacute;as, fundamentalmente a meningiomas.    <br> Histol&oacute;gicamente las lesiones corresponden    a una proliferaci&oacute;n celular de h&aacute;bito meningotelial que se dispone    alrededor de los vasos corticales. A pesar de que todos los casos tienen caracter&iacute;sticas    comunes, existe un amplio espectro de formas histol&oacute;gicas, que abarca    desde casos m&aacute;s celulares hasta casos m&aacute;s fibrosos con calcificaciones.    Estas diferencias podr&iacute;an corresponder a diferentes estadios evolutivos    de la lesi&oacute;n. La extirpaci&oacute;n de la lesi&oacute;n conlleva la desaparici&oacute;n    de los s&iacute;ntomas.</font></P >     <P ><font face="Verdana" size="2"><b>Palabras clave</b>: Corteza cerebral. Hamartoma, Leptomeninge. Meningioangiomatosis. Meningioma. Tumor.</font></P > <hr size="1">     <P ><b><font face="Verdana" size="2">SUMMARY</font></b></P >     <P ><font face="Verdana" size="2">Meningioangiomatosis (MA) is a rare benign intracraneal    lesion. The majority of cases are sporadic although the association of this    lesion with familial neurofibromatosis (NF) type 2 is well known. NF-associated    MA may be multifocal and is often asymptomatic and diagnosed at autopsy. Non-associated    cases are usually symptomatic, occurs in children and young adults and frequently    arise in leptomeninges and underlying cerebral cortex.    <br> In the present work, we describe two new non-associated    cases of MA in two boys, seven and one year old with seizures that disappeared    after surgical excision.    <br> Histopathologically, the lesion was predominantly    cellular in one case and more fibrous in the other.    <br> From the literature review we concluded that    sporadic cases present as single lesions which manifest by seizures or persistent    headaches. Rarely MA has been described to coexist with meningiomas.    ]]></body>
<body><![CDATA[<br> Histopathologically, MA is characterized by a    plaque-like proliferation of meningothelial and fibroblast-like cells surrounding    small vessels and trapping islands of gliotic cortical tissue. The lesion does    not show significant atypia, mitosis or necrosis. Although all cases of MA share    unifying features, there are different degrees of histological presentation    with cases predominantly cellular and others more fibrous and calcified. This    could correspond to different stages in the evolution of the MA. Symptoms disappear    with the complete excision of the lesion.</font></P >     <P ><font face="Verdana" size="2"><b>Key words</b>: Cerebral cortex. Hamartoma. Leptomeninge. Meningioangiomatosis. Meningioma. Tumour.</font></P > <hr size="1">     <P >&nbsp;</P >     <P ><B><font face="Verdana" size="3">Introducci&oacute;n</font> </b></P >     <P ><font face="Verdana" size="2">La meningioangiomatosis (MA) es una lesi&oacute;n    intracraneal benigna poco frecuente, que suele presentarse en ni&ntilde;os y    adultos j&oacute;venes. Cl&iacute;nicamente puede ser asintom&aacute;tico o    presentar desde dolor de cabeza hasta crisis convulsivas.</font></P >     <P ><font face="Verdana" size="2">Se han descrito casos aislados y casos asociados    a neurofibromatosis (NF) tipo 2 y a meningiomas (con o sin NF tipo 2). En los    pacientes con NF la MA es, en general, cl&iacute;nicamente silente, representando    un hallazgo incidental en la autopsia<Sup>34</Sup>. Wiebe y cols.<Sup>34 </Sup>aportaron    7 nuevos casos de MA no asociada a NF. En su trabajo analizaron 13 casos publicados    de MA asociados a NF y 43 no asociados a NF (dos de ellos publicados por uno    de nosotros<Sup>9</Sup>).</font></P >     <P ><font face="Verdana" size="2">Posteriormente al estudio de Wiebe y cols.<Sup>34</Sup>,    se han publicado 27 casos nuevos no asociados a NF, lo que totaliza 77 hasta    ahora descritos.</font></P >     <P ><font face="Verdana" size="2">En este trabajo describimos dos nuevos casos no    asociados a NF, y revisamos los aspectos cl&iacute;nicos y patol&oacute;gicos    m&aacute;s relevantes de la MA no asociada a NF 2.</font></P >     <P >&nbsp;</P >     <P ><B><font face="Verdana" size="3">Casos cl&iacute;nicos</font> </b></P >     ]]></body>
<body><![CDATA[<P ><font face="Verdana" size="2"><B><I>Caso 1</I></b>. Var&oacute;n de 7 a&ntilde;os,    nervioso e hiperquin&eacute;tico, que durante 2 o 3 meses present&oacute; episodios    nocturnos de sobresalto, de los cuales se despertaba llorando o hablando en    voz alta sobre episodios vividos durante el d&iacute;a.</font></P >     <P ><font face="Verdana" size="2">La exploraci&oacute;n neurol&oacute;gica s&oacute;lo    mostr&oacute; una dudosa afectaci&oacute;n campim&eacute;trica temporal superior    izquierda del ojo izquierdo.</font></P >     <P ><font face="Verdana" size="2">En el TC craneal se apreci&oacute; una imagen calcificada    densa t&eacute;mporo-occipital derecha, con patr&oacute;n en girasol, sin realce    despu&eacute;s de la inyecci&oacute;n de contraste, con atrofia focal del par&eacute;nquima    subyacente. Con RM se observ&oacute; una masa hipointensa de 4'5 x 3'5 x 2'5cm,    sin car&aacute;cter infiltrativo.</font></P >     <P ><font face="Verdana" size="2">Se realiz&oacute; una craniectom&iacute;a occipital    derecha, y se procedi&oacute; a la extirpaci&oacute;n microquir&uacute;rgica    de la lesi&oacute;n.</font></P >     <P ><font face="Verdana" size="2">Histol&oacute;gicamente, en el espesor de la corteza    cerebral se aprecia un n&oacute;dulo constituido por abundante tejido hialinizado,    con dep&oacute;sitos de sales c&aacute;lcicas e islotes de c&eacute;lulas fusiformes    dispuestas en haces, sin evidencia de tejido nervioso. En la periferia del n&oacute;dulo    se aprecian yemas de c&eacute;lulas fusiformes sin atipia que a&iacute;slan    n&oacute;dulos de tejido nervioso con gliosis (<a href="#f1">Figura 1</a>). El diagn&oacute;stico    an&aacute;tomopatol&oacute;gico es de MA. Ocho a&ntilde;os despu&eacute;s de    la intervenci&oacute;n quir&uacute;rgica el paciente est&aacute; asintom&aacute;tico    y sin medicaci&oacute;n.</font></P >     <P >&nbsp;</P >     <p align="center"><font face="Verdana"><a name="f1"><img src="/img/revistas/neuro/v17n3/5_1.jpg" width="314" height="737"></a></font>     <P align="center" ><font face="Verdana" size="2">Figura 1. <i>Caso 1: En 1. A y 1. B se observan n&oacute;dulos hialinos perivasculares&nbsp;    <br>   con escasa celularidad fusiforme en la periferia de &eacute;stos&nbsp;    <br>  (1A: HE x 40,    1.B: Tricromico de Masson x 40).&nbsp;    ]]></body>
<body><![CDATA[<br>  En 1. C se observan n&oacute;dulos hialinos    con dep&oacute;sitos de sales c&aacute;lcicas y yemas&nbsp;    <br>  de c&eacute;lulas fusiformes    en la periferia de la lesi&oacute;n (HE x 100).</i></font></P >     <P align="center" >&nbsp;</P >     <P ><font face="Verdana" size="2"><B><I>Caso 2</I></B>. Var&oacute;n de 1 a&ntilde;o    de edad, que acude al hospital tras presentar un episodio que comenz&oacute;    con movimientos cl&oacute;nicos en los dedos de la mano izquierda, que se propagaron    a toda la mano y m&aacute;s tarde a todo el hemicuerpo izquierdo. Junto a estos,    present&oacute; parpadeo de ojo izquierdo con desviaci&oacute;n de la mirada    hacia la izquierda. La duraci&oacute;n total del episodio fue de 15 a 20 min.</font></P >     <P ><font face="Verdana" size="2">La TC craneal mostr&oacute; una imagen no calcificada    cortical temporal, asociada a una zona de realce confluente con zonas lineales    y puntuales, acompa&ntilde;ado de edema vasog&eacute;nico. Con RM se observ&oacute;    una lesi&oacute;n c&oacute;rticosubcortical en la vertiente posterior de la    circunvoluci&oacute;n temporal superior derecha, de 2 x 2 x 2 cm., sin provocar    efecto masa significativo, multilobulada. Los componentes s&oacute;lidos presentan    realce significativo tras la administraci&oacute;n de contraste intravenoso.    En la sustancia blanca adyacente se apreci&oacute; un cambio de se&ntilde;al    sugerente de corresponder a ligero edema vasog&eacute;nico que no produce efecto    masa significativo.</font></P >     <P ><font face="Verdana" size="2">Se extirp&oacute; la lesi&oacute;n mediante craneotom&iacute;a temporal derecha.</font>  </P >     <P ><font face="Verdana" size="2">Histol&oacute;gicamente la leptomeninge est&aacute; engrosada por aumento de    la celularidad en forma de placa. Desde la leptomeninge se proyectan hacia el    interior de la corteza digitaciones de c&eacute;lulas fusiformes u ovaladas    que se disponen alrededor de vasos, formando tabiques intracorticales, que a&iacute;slan    n&oacute;dulos de tejido nervioso (<a href="#f2">Figura 2</a>). No se observa fibrosis, hialinizaci&oacute;n    ni dep&oacute;sitos de sales c&aacute;lcicas. El diagn&oacute;stico anatomopatol&oacute;gico    es de MA.</font> </P >     <P ><font face="Verdana" size="2">Cinco meses despu&eacute;s de la intervenci&oacute;n quir&uacute;rgica, el paciente    no presenta crisis.</font> </P >     <P >&nbsp; </P >     <p align="center"><font face="Verdana"><a name="f2"> <img src="/img/revistas/neuro/v17n3/5_2.jpg" width="313" height="718"></a></font>      ]]></body>
<body><![CDATA[<p align="center"><font face="Verdana" size="2"> Figura 2. <I>Caso 2: En 2. A se aprecia engrosamiento&nbsp;    <br>   de la leptomeninge con proyecciones&nbsp;    <br>  digitiformes penetrando hacia el&nbsp;    <br>   interior de la corteza (HE x 40).&nbsp;    <br>  En 2. B y 2.</I> <i>C se observa un detalle    de las digitaciones&nbsp;    <br>  con c&eacute;lulas fusiformes alrededor de los vasos&nbsp;    <br>  (HE x 200) En 2. C las c&eacute;lulas de las digitaciones&nbsp;    <br>  son inmunorreactivas para Vimentina (x 100). </i></font></p>      <p><B><font face="Verdana" size="3">Discusi&oacute;n</font> </b></p>     <p><font face="Verdana" size="2">Tras el trabajo de Wiebe y cols.<Sup>34</Sup> se han publicado al menos 27 pacientes con MA no asociada a NF, que, junto a los 2 aportados en este estudio totalizan 29 nuevos casos m&aacute;s<Sup>1,4,7,12,13,15,16,18,19,21-24,28-32</Sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Un 63% de los pacientes<Sup>50</Sup> son varones y un 33%<Sup>29</Sup> mujeres, observ&aacute;ndose por tanto un claro predominio masculino.</font></p>     <p><font face="Verdana" size="2">La distribuci&oacute;n por edad de los pacientes analizados por Wiebe y cols.<Sup>34</Sup> abarcaba desde los 9 meses hasta los 70 a&ntilde;os, con una media de 28 a&ntilde;os de edad; en los estudios posteriores las edades abarcan desde los 12 meses hasta los 71 a&ntilde;os, con una media de 21 a&ntilde;os. La media de edad de los 79 casos publicados es de 24 a&ntilde;os.</font></p>     <p><font face="Verdana" size="2">La manifestaci&oacute;n cl&iacute;nica m&aacute;s frecuente observada en 45 de los 79 casos descritos son las convulsiones (57%). El resto de los casos presentaron desde dolor de cabeza a dolor facial o par&aacute;lisis de pares faciales. En 3 casos no hemos podido recoger datos sobre la cl&iacute;nica<Sup>13,21,30</Sup>.</font></p>     <p><font face="Verdana" size="2">Com&uacute;nmente la MA es intracortical y localizada en regi&oacute;n fronto-temporal derecha, si bien tambi&eacute;n puede ser bi-hemisf&eacute;rica<Sup>9</Sup>. Se han descrito localizaciones at&iacute;picas como cuerpo calloso<Sup>14</Sup> y tronco cerebral<Sup>6,17</Sup>.</font></p>     <p><font face="Verdana" size="2">La lesi&oacute;n suele ser &uacute;nica, aunque tambi&eacute;n se han descrito    lesiones m&uacute;ltiples, generalmente en casos asociados a NF<Sup>5,10,11,27</Sup>,    pero tambi&eacute;n en casos aislados<Sup>24,25</Sup>.</font></p>     <p><font face="Verdana" size="2">Aunque se han descrito casos de MA asociados a malformaciones arterio-venosas,    a encefalocele<Sup>33 </Sup>y a oligodendroglioma<Sup>20</Sup>, la asociaci&oacute;n    m&aacute;s frecuente es con un meningioma. En la literatura se han descrito    14 casos de MA asociada a meningioma<Sup>2,3,7,15,19,21,30,35</Sup>.</font></p>     <p><font face="Verdana" size="2">Histol&oacute;gicamente, se trata de una proliferaci&oacute;n de c&eacute;lulas    meningoteliales, inmunorreactivas para vimentina y EMA, que puede mostrarse    como un engrosamiento focal de la leptomeninge desde la que penetran tabiques    en la corteza, o bien como una lesi&oacute;n exclusivamente intracortical sin    relaci&oacute;n con la leptomeninge. La magnitud de las lesiones intracorticales    es tambi&eacute;n variable, desde peque&ntilde;os tabiques o fasc&iacute;culos    perivasculares hasta aut&eacute;nticos n&oacute;dulos.</font></p>     <p><font face="Verdana" size="2">En la literatura est&aacute;n descritos casos que muestran este amplio espectro    histol&oacute;gico, desde patrones celulares<Sup>18 </Sup>hasta patrones fibrosos    y calcificados<Sup>12</Sup>. Estas diferencias podr&iacute;an deberse a estadios    evolutivos distintos de la lesi&oacute;n, siendo las lesiones predominantemente    fibrosas las consecutivas a la evoluci&oacute;n de las lesiones predominantemente    celulares.</font></p>     <p><font face="Verdana" size="2">De hecho, los casos presentados son diferentes histol&oacute;gicamente, pudiendo    corresponder el <B><I>Caso 2 </I></B>(1 a&ntilde;o de edad) a un estadio m&aacute;s    inicial, con engrosamiento de la leptomeninge y tabiques constituidos por c&eacute;lulas    fusiformes penetrando en la corteza, y el <B><I>Caso 1 </I></B>(7 a&ntilde;os    de edad), a un estadio m&aacute;s avanzado, con una lesi&oacute;n intracortical,    con menos celularidad y con n&oacute;dulos hialinos.</font></p>     <p><font face="Verdana" size="2">La MA es una lesi&oacute;n poco conocida cuya patogenia no est&aacute; clara.    Se ha relacionado con un hamartoma, con un meningioma e incluso con una malformaci&oacute;n    vascular<Sup>8,17,26</Sup>. Wiebe y cols<Sup>34 </Sup>sugieren el origen de    la MA en una c&eacute;lula pluripotencial que se diferenciar&iacute;a en los    diferentes componentes encontrados en esta lesi&oacute;n. Otros autores<Sup>12    </Sup>hablan de un origen fibrobl&aacute;stico o en c&eacute;lulas de m&uacute;sculo    liso.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El diagn&oacute;stico diferencial m&aacute;s importante de la MA es con el meningioma,    ya que el pron&oacute;stico y evoluci&oacute;n de estas dos entidades es completamente    distinta. Adem&aacute;s la MA puede simular un meningioma invasivo.</font></p>     <p><font face="Verdana" size="2">T&iacute;picamente se habla de meningioma invasivo cuando las c&eacute;lulas    tumorales rompen la piamadre infiltrando la corteza subyacente. El patr&oacute;n    de crecimiento en nidos y la eventual presencia de atipia y mitosis apoyar&iacute;a    el diagn&oacute;stico de meningioma invasivo. En caso de ausencia de atipia    celular, el patr&oacute;n de crecimiento perivascular y la presencia de ovillos    neurofibrilares en las neuronas del tejido cortical residual<Sup>10,22</Sup>    apoyar&iacute;an el diagn&oacute;stico de MA.</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n se ha descrito un caso de meningioma intraparenquimatoso bien delimitado del par&eacute;nquima adyacente y constituido por c&eacute;lulas que expresaban vimentina y EMA, asociado a MA adyacente con ovillos neurofibrilares en el tejido cortical respetado<Sup>23</Sup>. Se postul&oacute; que el meningioma se originaba a partir de la MA, aunque tambi&eacute;n podr&iacute;a corresponder a un n&oacute;dulo hiperpl&aacute;sico de la MA.</font></p>     <p><font face="Verdana" size="2">En resumen, la MA sintom&aacute;tica suele presentarse durante la infancia y adolescencia y se manifiesta por convulsiones. Es una lesi&oacute;n &uacute;nica, cortical o cortico-subcortical, en la regi&oacute;n frontotemporal. Su extirpaci&oacute;n quir&uacute;rgica conlleva la desaparici&oacute;n de las crisis. Histol&oacute;gicamente muestra un espectro que abarca desde formas celulares a formas fibrosas, algunas hialinizadas y calcificadas. Dada su frecuente asociaci&oacute;n a meningiomas, debe diferenciarse de meningiomas infiltrantes.</font></p>      <p>&nbsp;</p>     <p><b><font face="Verdana" size="3">Bibliograf&iacute;a</font></b></p>     <!-- ref --><p><font face="Verdana" size="2">1. Al-Hindi, H., Subach, B., Hamilton, R.L.: Case of the month: A 7 years old girl with seizures. 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Wilson, D., Dempsey, R.J., Clark, D.B.: Meningioma developing from underlying meningioangiomatosis. J Neuropathol Exp Neurol 1991; 50: 371.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3359473&pid=S1130-1473200600030000500035&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p><font face="Verdana"><font size="2"><b><a href="#top10"><img border="0" src="/img/revistas/neuro/v17n3/seta.gif" width="15" height="17"></a> <a name="Dirección">Dirección</a> para correspondencia</b></font>:&nbsp;<font size="2">    <br> Jos&eacute; R. Ricoy.&nbsp;    <br> Anatom&iacute;a Patol&oacute;gica / Neuropatolog&iacute;a.&nbsp;    <br> Hospital Universitario 12 de Octubre.&nbsp;    <br> Avda de C&oacute;rdoba, s/n. 28041 - Madrid</font></font></p>     <p><font size="-1" face="Verdana">Recibido<I>:  </I> 01-02.05.&nbsp;    <br> Aceptado: 18-02-05</font></p>     <p><font face="Verdana" size="2"><u>Abreviaturas</u>. MA: meningioangiomatosis. NF: neurofibromatosis</font></p>      ]]></body>
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